Microplastics in the Human Body: What They Are, Health Risks, and How to Reduce Exposure

Microplastics in the Human Body: What They Are, Health Risks, and How to Reduce Exposure

Let’s get something out of the way:

Microplastics are not just floating around in oceans next to sad turtles.

They’re in your water.
Your food.
Your clothes.
Your morning coffee.

And—this is where it stops being a fun environmental issue—

they’ve been detected inside the human body.

Yes. Inside.

Welcome to the part of health no one wants to think about.

Wait… what actually are microplastics?

Microplastics are tiny plastic particles (smaller than 5mm) that come from:

  • broken-down plastics
  • synthetic fabrics (polyester, nylon)
  • food packaging
  • bottled water
  • even “safe” everyday items like cutting boards and coffee pods

They’re small enough to:

  • be inhaled
  • be ingested
  • and in some cases… be absorbed

So no, you’re not avoiding them completely.

But the real issue isn’t just exposure.

It’s repeated exposure over time.

The part where it gets uncomfortable

In 2022, researchers published a study showing that microplastics were detected in human blood.

This suggests they may not be simply passing through the digestive system like a tourist.

They’re getting in.

Leslie et al., 2022 — “Plastic particles are bioavailable for uptake into the human bloodstream”

Then it got worse.

Researchers found microplastics in human placentas—on both the maternal and fetal side.

Ragusa et al., 2021 — “Microplastics were found in all portions of the placenta”

Translation:

These particles appear capable of crossing biological barriers your body usually protects very carefully.

Not ideal.

So where do they go?

Short answer:

everywhere scientists have looked so far.

Microplastics have been detected in:

  • blood
  • lungs
  • liver
  • kidneys
  • placenta
  • and more recently… brain tissue

Multiple reviews (Harvard Medicine, Nature, etc.) report detection across human systems.

So no, this isn’t a “one organ” situation.

This is a whole-body exposure story.

Okay, but do they actually do anything?

This is where we need to be honest:

Science is still figuring out the full impact.

But here’s what research suggests from human data + lab studies:

1. They may trigger inflammation

Microplastics are foreign particles.

Your body doesn’t look at them and go:

“ah yes, organic, welcome in.”

It responds more like:

“what is this and why is it here”

Which may lead to:

  • immune activation
  • oxidative stress
  • low-grade inflammation

Reviews have linked microplastics to inflammatory responses and cellular stress.

2. They can carry endocrine-disrupting chemicals

Microplastics often contain or attract compounds like:

  • BPA
  • phthalates

These are known to interfere with hormone signaling.

So it’s not just the plastic.

It’s what comes with it.

3. They’ve been found in arterial plaque

Recent research has detected microplastics in atherosclerotic plaque.

Some findings show an association between their presence and increased risk of cardiovascular events.

Now we’re no longer talking theory.

We’re talking early signals linked to real outcomes.

4. You’re inhaling them too

Microplastics aren’t just something you eat.

They’re in the air—especially indoors.

They can reach deep into the lungs and may contribute to:

  • inflammation
  • irritation
  • impaired respiratory function

Pulmonary exposure research shows deposition in lung tissue.

Why your body doesn’t just “get rid of them”

Here’s the uncomfortable truth:

Your body is very good at processing biological substances.

Plastic is not one of them.

Some particles may be excreted.

Others?

They may:

  • persist in tissue
  • accumulate with repeated exposure
  • interact with cells

Which is why this isn’t about one bad exposure.

It’s about:

a thousand small exposures, every day, for years

The everyday sources no one thinks about

You don’t need to be drinking out of a melted water bottle to be exposed.

It’s the normal stuff:

  • Hot coffee in plastic-lined cups
  • K-cups / coffee pods
  • Plastic water bottles
  • Takeout containers
  • Heating food in plastic
  • Synthetic clothing (yes, your gym fit)
  • Plastic cutting boards (you’re literally shaving plastic into your food)
  • Non-stick cookware
  • Tea bags (many contain plastic)

Basically:

If it’s convenient, cheap, and modern…

…it probably involves plastic.

So what do you actually do? (without moving into the woods)

You don’t need to go full survival mode.

But reducing your biggest exposures can make a meaningful difference.

Start here:

  • Switch to glass or stainless steel for water
  • Avoid heating food in plastic
  • Use wood or stainless cutting boards
  • Swap K-cups → pour over / metal filter
  • Choose more cotton, wool, natural fabrics
  • Let hot food cool before storing
  • Use a water filter (carbon or RO)

You’re not aiming for perfection.

You’re lowering the load.

The Nine Lives take

You’re not broken.

Your body isn’t fragile.

But it is:

dealing with things it was never designed to handle

Microplastics are one of those things.

The goal isn’t panic.

It’s awareness → small changes → less cumulative stress over time.

Final thought

You can’t eliminate microplastics completely.

But you can:

  • reduce daily exposure
  • reduce long-term accumulation
  • reduce the overall burden on your system

And that’s how real health improvements happen.

Not overnight.

But over time.

If you made it this far…

You’re already ahead of 99% of people still microwaving leftovers in plastic.

 

Sources

 

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